In mammals with external testicles it is most common for one testis to hang lower than the other. It is estimated that in about 85% of men the lower hanging testicle is the right one. This is due to differences in the vascular anatomical structure on the right and left sides. With an orchidometer we can suggest the size/volume of testicles.

Yes, an expert in Andrology told me so few times ago, about the difference of right and testicle of their hung position and the volume. The right one usually is bigger, lower, contains more spermatozoa